Answer:
Diffusion is the process in which molecules and ions move from a region of high concentration to low concentration. Its also how cells transport waste out of the cell and nutrients into it hence being very crucial. Diffusion also occurs without the expenditure of extra energy using a procedure known as passive transport. (Osmosis is a form of diffusion but deals with water exclusively).
Examples of where diffusion is important;
In the intestines - Digested food molecules such as amino acids and glucose move down the concentration gradient from the intestine into the bloodstream. Wastes such as carbon dioxide or urea travel via diffusion from the body's cells to the bloodstream.
Osmosis plays a major role in living organisms. It aids in the transportation of nutrients from cells to cells and also helps to remove the waste's metabolic products from the cell. The purification of blood in the kidneys is also dependent on the process of osmosis.
Because they each get half their dna from both parents. in pea plants for example the offspring have a total of 14 chromosomes thus inheriting 7 from each parent. plus genetic mutation is always a possibility making the offspring genetically different from the parents.<span />
Answer:
a. It has a negative value.
b. It is measured in millivolts.
c. It is measured in millivolts.
Explanation:
Resting membrane potential is typically ~ -70 millivolts so options a, b and c are correct, rest are false statements.
The resting membrane potential is -70 millivolts because more K+ is inside the neuron while more Na+ is outside the neuron and it reflects more negative voltage in the cytosol as compared to the interstitial fluid.
As soon as stimulus arrives, it causes more Na+ to move inside the neuron making the membrane potential as +20 millivolts and the neuron is said to be in 'depolarized state'. Soon after that K+ starts to move outside of the neuron and since K+ has positive charge and it is moving out of the cell so the membrane becomes more and more negative inside and at this time neuron is said to be in 'hyperpolarised state'.
Answer:
Scientists look into Earth's past to predict future effects of climate change or the very distant past, as well as those who study the present, to help make predictions about what the future holds for life on Earth as climate shifts.
Explanation:
<span>Protein export from the nucleus.</span>